William Mariner Greenman
CIK 1377258 · President and CEO · last filed 2026-03-16
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$12.80M
Companies
3
Total Filings
75
Lifetime Open-Market Net
-$6.24M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| CERS | President and CEO | 4,998,493 | $2.56 | $12.80M | -$6.17M | 60 | 2026-03-16 |
| CHINOOK THERAPEUTICS, INC. (KDNY) Delisted | Director | 0 | $40.39 | $0 | -$26.9K | 6 | 2023-08-11 |
| CHINOOK THERAPEUTICS, INC. (ADRO) Delisted | Director | 19,835 | — | — | -$41.0K | 9 | 2020-05-28 |
Recent Filings · Page 3 of 8
75 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2021-03-16 | CERS | Grant (A) | — | $0 | EDGAR |
| 2021-03-16 | CERS | Mixed | +171,289 | -$997.5K | EDGAR |
| 2021-03-03 | CERS | Grant (A) | — | $0 | EDGAR |
| 2020-10-07 | CHINOOK THERAPEUTICS, INC. (KDNY) Delisted | Grant (A) | — | $0 | EDGAR |
| 2020-08-26 | CERS | Exer (M) | +100,000 | $300.0K | EDGAR |
| 2020-05-28 | CHINOOK THERAPEUTICS, INC. (ADRO) Delisted | Grant (A) | — | $0 | EDGAR |
| 2020-03-24 | CERS | Mixed | +143,448 | -$388.3K | EDGAR |
| 2020-03-20 | CHINOOK THERAPEUTICS, INC. (ADRO) Delisted | Exer (M) | +19,835 | $8.9K | EDGAR |
| 2019-09-24 | CERS | Exer (M) | +40,000 | $86.0K | EDGAR |
| 2019-06-10 | CERS | Grant (A) | — | $0 | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.